Functional Catalyst Molecular Sieves in Green Chemical Applications

Abstract

With the development of green chemical industry and the continuous improvement of environmental awareness, the application of various catalysts in environmental protection has been widely concerned. As a green catalyst, molecular sieve catalyst has superior environmental performance, which is mainly reflected in its ability to improve the selectivity of reaction products, can be reused, good thermal stability and strong adaptability. This paper mainly introduces the types, development history, synthesis technology and application of zeolite catalysts, due to the development of science and technology, a large number of new synthetic zeolite catalysts are used in the field of catalysis and meet the requirements of green chemistry, and its synthesis technology is gradually trending towards environmental protection with the development of green chemistry. Zeolite catalysts are widely used in chemical industry and other fields, and their green environmental protection performance promotes the development of chemical processes in the direction of green chemicals.

Enhanced Effect of Carbon for the Ni/T-Nb2O5 Catalyst on Vanillin Hydrodeoxygenation in the Aqueous Phase

“…11 In addition, the properties of supports play an essential role in the catalytic performance of the HDO process. 12,13 Niobium oxide has been widely used in hydrogenolysis, dehydration, and HDO reactions as a water-resistant support due to its high acid strength, large number of water-resistant Bro̷ nsted, and Lewis acid sites. 14−16 Jing et al 15 prepared a Pd/Nb 2 O 5 catalyst by one-pot process for biomass-derived carbonyl compounds to liquid alkane and exhibited efficient activity, which was attributed to the fact that the acid sites of NbO x species reduced the energy barrier of C− O bonds cleavage.…”

“…In comparison with Fe-based and Co-based catalysts, Ni-based as-supported non-noble metal catalysts have been widely reported owing to the lower cost, higher hydrogenation activity toward aromatic groups, and higher selectivity toward deoxygenated products . In addition, the properties of supports play an essential role in the catalytic performance of the HDO process. , Niobium oxide has been widely used in hydrogenolysis, dehydration, and HDO reactions as a water-resistant support due to its high acid strength, large number of water-resistant Bro̷nsted, and Lewis acid sites. − Jing et al prepared a Pd/Nb 2 O 5 catalyst by one-pot process for biomass-derived carbonyl compounds to liquid alkane and exhibited efficient activity, which was attributed to the fact that the acid sites of NbO x species reduced the energy barrier of C–O bonds cleavage. Meanwhile, the serious carbon deposition and poor thermal stability result in a decrease in hydrogenation activity.…”

Functional Catalysts for Self-Supported Hydrodeoxygenation of Anisole in Water

“…6 The in situ generation of hydrogen from lignin is not only a green source of hydrogen but it also significantly reduces the carbon footprint. 7 Meng et al 8 reported hydrolysis of the aromatic Csp2−O(CH3) bond, which do not require any exogenous hydrogen or other reductants, called self-supported hydrogenolysis. Using hydrogen extracted in situ from the methoxy group, the Csp2 methoxyl group bonds are converted into Csp2−H bonds, and side hydrogenation of the benzene ring is completely avoided.…”

“…The hydrotreating process of exogenous lignin typically decreases the selectivity of benzene . The in situ generation of hydrogen from lignin is not only a green source of hydrogen but it also significantly reduces the carbon footprint . Meng et al reported hydrolysis of the aromatic Csp2–O­(CH3) bond, which do not require any exogenous hydrogen or other reductants, called self-supported hydrogenolysis.…”