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    					Highly dispersed Pd nanoparticles in situ reduced and stabilized by nitrogen-alkali lignin-doped phenolic nanospheres and their application in vanillin hydrodeoxygenation  | 
  					 
  					  										
						Xue Gu, Yu Qin, Jiahui Wei, Bing Yuan( ), Fengli Yu, Liantao Xin, Congxia Xie, Shitao Yu( ) | 
					 
															
						| State Key Laboratory Base of Eco-chemical Engineering, College of Chemistry and Molecular Engineering, College of Chemical Engineering, Qingdao University of Science and Technology, Qingdao 266042, China | 
					 
										
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													     		                            						                            																	    Abstract  Herein, we introduced a nitrogen-alkali lignin-doped phenolic resin (N@ALnPR) to produce palladium nanoparticles through an in situ reduction of palladium in an aqueous phase, without the need for additional reagents or a reducing atmosphere. The phenolic resin nanospheres and the resulting palladium nanoparticles were extensively characterized. Alkali lignin created a highly conducive environment for nitrogen incorporation, dispersion, reduction, and stabilization of palladium, leading to a distinct catalytic performance of palladium nanoparticles in vanillin hydrodeoxygenation. Under specific conditions of 1 mmol of vanillin, 40 mg of catalyst, 1 MPa H2, 90 °C, and 3 h, the optimized Pd/N@AL30PR catalyst exhibited a nearly complete conversion of vanillin, 98.9% selectivity toward p-creosol, and good stability for multiple reuses. Consequently, an environmentally friendly lignin-based catalyst was developed and used for the efficient hydrodeoxygenation conversion of lignin-based platform compounds. 
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															| Keywords 
																																																				alkali lignin  
																		  																																				phenolic nanosphere  
																		  																																				palladium nanoparticles  
																		  																																				hydrodeoxygenation  
																		  																																				vanillin  
																																			  
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																																Corresponding Author(s):
																Bing Yuan,Shitao Yu   
																													     		
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																															Just Accepted Date: 21 May 2024  
																																																													Issue Date: 24 July 2024
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