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    					New approaches to vibrational spectroscopy of zeolite catalysts: a perspective  | 
  					 
  					  										
						Russell F Howe( ) | 
					 
															
						| Chemistry Department, University of Aberdeen, Aberdeen 999020, UK | 
					 
										
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													     		                            						                            																	    Abstract  This perspective discusses three alternative techniques which complement conventional infrared spectroscopy for obtaining vibrational information about zeolite catalysts and adsorbed molecules: inelastic neutron scattering, infrared micro-spectroscopy, and two-dimensional infrared spectroscopy. The techniques are illustrated briefly and future prospects for their use discussed. 
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															| Keywords 
																																																				FTIR  
																		  																																				zeolites  
																		  																																				INS  
																		  																																				micro-spectroscopy  
																		  																																				2D FTIR  
																																			  
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																																Corresponding Author(s):
																Russell F Howe   
																													     		
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															| About author:  Chunqi Yang contributed equally to this work.  | 
														 
																												
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																															Just Accepted Date: 13 May 2024  
																																																													Issue Date: 31 July 2024
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														      A Zachariou, A P Hawkins, R F Howe, J M S Skakle, N Barrow, P Collier, D W Nye, R I Smith, G B G Stenning, S F Parker. et al.. Counting the acid sites in a commercial ZSM-5 zeolite catalyst. ACS Physical Chemistry Au, 2023, 3(1): 74–83 
														     														     	 
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															| 10 | 
															 
														      A P Hawkins, A Zachariou, P Collier, R A Ewings, R F Howe, S F Parker, D Lennon. Low-temperature studies of propene oligomerization in ZSM-5 by inelastic neutron scattering spectroscopy. RSC Advances, 2019, 9(33): 18785–18790 
														     														     	 
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															| 11 | 
															 
														      A P Hawkins, A Zachariou, S F Parker, P Collier, N S Barrow, I P Silverwood, R F Howe, D Lennon. Effect of steam de-alumination on the interactions of propene with H-ZSM-5 zeolites. RSC Advances, 2020, 10(39): 23136–23147 
														     														     	 
														     															     		https://doi.org/10.1039/D0RA03871G
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															| 12 | 
															 
														      A P Hawkins, A Zachariou, S F Parker, P Collier, I P Silverwood, R F Howe, D Lennon. Onset of propene oligomerization reactivity in ZSM-5 studied by inelastic neutron scattering spectroscopy. ACS Omega, 2020, 5(14): 7762–7770 
														     														     	 
														     															     		https://doi.org/10.1021/acsomega.9b03503
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															| 13 | 
															 
														      A P Hawkins, A J O’Malley, A Zachariou, P Collier, R A Ewings, I P Silverwood, R F Howe, S F Parker, D Lennon. Investigation of the dynamics of 1-octene adsorption at 293 K in a ZSM-5 catalyst by inelastic and quasielastic neutron scattering. Journal of Physical Chemistry C, 2019, 123(1): 417–425 
														     														     	 
														     															     		https://doi.org/10.1021/acs.jpcc.8b08420
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															| 14 | 
															 
														      A P Hawkins, A Zachariou, S F Parker, P Collier, N S Barrow, R F Howe, D Lennon. On the transition to gasoline-to-olefins chemistry in the cracking reactions of 1-octene over H-ZSM-5 catalysts. Applied Catalysis A, General, 2023, 667: 119442 
														     														     	 
														     															     		https://doi.org/10.1016/j.apcata.2023.119442
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															| 15 | 
															 
														      A P Hawkins, A Zachariou, S F Parker, P Collier, R F Howe, D Lennon. Studies of propene conversion over H-ZSM-5 demonstrate the importance of propene as an intermediate in methanol-to-hydrocarbons chemistry. Catalysis Science & Technology, 2021, 11(8): 2924–2938 
														     														     	 
														     															     		https://doi.org/10.1039/D1CY00048A
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															| 16 | 
															 
														      S Suwardiyanto, R F Howe, E K Gibson, C R A Catlow, A Hameed, J McGregor, P Collier, S F Parker, D Lennon. An assessment of hydrocarbon species in the methanol-to-hydrocarbon reaction over a ZSM-5 catalyst. Faraday Discussions, 2017, 197: 447–471 
														     														     	 
														     															     		https://doi.org/10.1039/C6FD00195E
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															| 17 | 
															 
														      A Zachariou, A P Hawkins, D Lennon, S F Parker, S Suwardiyanto, S K Matam, C R A Catlow, P Collier, A Hameed, J McGregor. et al.. Investigation of ZSM-5 catalysts for dimethylether conversion using inelastic neutron scattering. Applied Catalysis A, General, 2019, 569: 1–7 
														     														     	 
														     															     		https://doi.org/10.1016/j.apcata.2018.10.010
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															| 18 | 
															 
														      A Zachariou, A P Hawkins, P Collier, R F Howe, S F Parker, D Lennon. The effect of co-feeding methyl acetate on the H-ZSM5 catalysed methanol-to-hydrocarbons reaction. Topics in Catalysis, 2020, 63(3–4): 370–377 
														     														     	 
														     															     		https://doi.org/10.1007/s11244-020-01258-3
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															| 19 | 
															 
														      A Zachariou, A P Hawkins, S F Parker, D Lennon, R F Howe. Neutron spectroscopy studies of methanol to hydrocarbons catalysis over ZSM-5. Catalysis Today, 2021, 368: 20–27 
														     														     	 
														     															     		https://doi.org/10.1016/j.cattod.2020.05.030
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															| 20 | 
															 
														      A Zachariou, A P Hawkins, S Suwardiyanto, P Collier, N Barrow, R F Howe, S F Parker, D Lennon. New spectroscopic insight into the deactivation of a ZSM-5 methanol-to-hydrocarbons catalyst. ChemCatChem, 2021, 13(11): 2625–2633 
														     														     	 
														     															     		https://doi.org/10.1002/cctc.202100286
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															| 21 | 
															 
														      A Zachariou, A P Hawkins, R F Howe, N Barrow, J Bradley, P Collier, D Lennon, S F Parker. A spectroscopic paradox: the interaction of methanol with ZSM-5 at room temperature. Topics in Catalysis, 2021, 64(9–12): 672–684 
														     														     	 
														     															     		https://doi.org/10.1007/s11244-021-01462-9
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															| 22 | 
															 
														      A Zachariou, A P Hawkins, P Collier, R F Howe, S F Parker, D Lennon. Neutron scattering studies of the methanol-to-hydrocarbons reaction. Catalysis Science & Technology, 2023, 13(7): 1976–1990 
														     														     	 
														     															     		https://doi.org/10.1039/D2CY02154D
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															| 23 | 
															 
														      R F Howe, S Suwardiyanto, D J Price, M Castro, P A Wright, A Greenaway, M D Frogley, G Cinque. Reactions of dimethylether in single crystals of the silicoaluminophosphate STA-7 studied via operando synchrotron infrared microspectroscopy. Topics in Catalysis, 2018, 61(3–4): 199–212 
														     														     	 
														     															     		https://doi.org/10.1007/s11244-018-0890-9
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															| 24 | 
															 
														      I B Minova, S K Matam, A Greenaway, C R A Catlow, M D Frogley, G Cinque, P A Wright, R F Howe. Elementary steps in the formation of hydrocarbons from surface methoxy groups in HZSM-5 seen by synchrotron infrared micro-spectroscopy. ACS Catalysis, 2019, 9(7): 6564–6570 
														     														     	 
														     															     		https://doi.org/10.1021/acscatal.9b01820
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															| 25 | 
															 
														      I B Minova, S K Matam, A Greenaway, C R A Catlow, M D Frogley, G Cinque, P A Wright, R F Howe. Effects of crystal size on methanol to hydrocarbon conversion over single crystals of ZSM-5 studied by synchrotron infrared microspectroscopy. Physical Chemistry Chemical Physics, 2020, 22(34): 18849–18859 
														     														     	 
														     															     		https://doi.org/10.1039/D0CP00704H
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															| 26 | 
															 
														      I B Minova, M Bühl, S K Matam, C R A Catlow, M D Frogley, G Cinque, P A Wright, R F Howe. Carbene-like reactivity of methoxy groups in a single crystal SAPO-34 MTO catalyst. Catalysis Science & Technology, 2022, 12(7): 2289–2305 
														     														     	 
														     															     		https://doi.org/10.1039/D1CY02361F
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															| 27 | 
															 
														      P M Donaldson, R F Howe, A P Hawkins, M Towrie, G M Greetham. Ultrafast 2D-IR spectroscopy of intensely optically scattering pelleted solid catalysts. Journal of Chemical Physics, 2023, 158(11): 114201 
														     														     	 
														     															     		https://doi.org/10.1063/5.0139103
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															| 28 | 
															 
														      P M Donaldson. Spectrophotometric concentration analysis without molar absorption coefficients by two-dimensional-infrared and Fourier transform infrared spectroscopy. Analytical Chemistry, 2022, 94(51): 17988–17999 
														     														     	 
														     															     		https://doi.org/10.1021/acs.analchem.2c04287
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															| 29 | 
															 
														      A P Hawkins, A E Edmeades, C D M Hutchison, M Towrie, R F Howe, G M Greetham, P M Donaldson. Laser induced temperature-jump time resolved IR spectroscopy of zeolites. Chemical Science, 2024, 15(10): 3453–3465 
														     														     	 
														     															     		https://doi.org/10.1039/D3SC06128K
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