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    					Benzenesulfonic acid-grafted UIO-66 with improved hydrophobicity as a stable Brønsted acid catalyst  | 
  					 
  					  										
						Zongliang Kou1, Guanlun Sun1, Qiuyan Ding1, Hong Li1( ), Xin Gao1,2, Xiaolei Fan3,4( ), Xiaoxia Ou4, Qinhe Pan5( ) | 
					 
															
						1. School of Chemical Engineering and Technology, National Engineering Research Center of Distillation Technology, Collaborative Innovation Center of Chemical Science and Engineering (Tianjin), Tianjin University, Tianjin 300072, China 2. Haihe Laboratory of Sustainable Chemical Transformations, Tianjin 300192, China 3. Department of Chemical Engineering, School of Engineering, The University of Manchester, Manchester M13 9PL, UK 4. Nottingham Ningbo China Beacons of Excellence Research and Innovation Institute, University of Nottingham Ningbo China, Ningbo 315100, China 5. Key Laboratory of Ministry of Education for Advanced Materials in Tropical Island Resources, School of Chemical Engineering and Technology, Hainan University, Haikou 570228, China | 
					 
										
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													     		                            						                            																	    Abstract  Hydrothermal and catalytic stability of UIO-66 MOFs with defective structures are critical aspects to be considered in their catalytic applications, especially under the conditions involving water, moisture and/or heat. Here, we report a facile strategy to introduce the macromolecular acid group to UIO-66 to improve the stability of the resulting UIO-66−PhSO3H MOF in aqueous phase catalysis. In detail, UIO-66−PhSO3H was obtained by grafting benzenesulfonic acid on the surface of the pristine UIO-66 to introduce the hydrophobicity, as well as the Brønsted acidity, then assessed using catalytic hydrolysis of cyclohexyl acetate (to cyclohexanol) in water. The introduction of hydrophobic molecules to UIO-66 could prevent the material from being attacked by hydroxyl polar molecules effectively, explaining its good structural stability during catalysis. UIO-66−PhSO3H promoted the conversion of cyclohexyl acetate at ca. 87%, and its activity and textural properties were basically intact after the cyclic stability tests. The facile modification strategy can improve the hydrothermal stability of UIO-66 significantly, which can expand its catalytic applications in aqueous systems. 
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															| Keywords 
																																																				metal−organic frameworks (MOFs)  
																		  																																				UIO-66  
																		  																																				hydrolysis of cyclohexyl acetate  
																		  																																				hydrophobicity  
																		  																																				Brønsted acidity  
																																			  
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																																Corresponding Author(s):
																Hong Li,Xiaolei Fan,Qinhe Pan   
																													     		
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																																														Online First Date: 12 April 2023   
																																														Issue Date: 07 October 2023
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