A nickel-based oxygen vacancy carrier catalyst and its preparation method and application

Abstract

The invention provides a nickel-based oxygen vacancy carrier catalyst and its preparation method and application, belonging to the fields of catalytic reforming and diesel hydrogen production. The catalyst provided by the invention solves the problems of low diesel reforming catalyst activity, easy coking and poor sulfur resistance. Cerium dioxide serves as an oxygen carrier and in CeO 2 The medium doping of heterovalent metal La reduces the oxygen vacancy generation energy, and the enhancement of the carrier's ability to store and release oxygen can inhibit side reactions and thereby increase the activity of the main reaction. Diesel H / C is relatively low, and a large amount of carbon deposits are prone to occur during reforming. When coking occurs, the oxygen vacancy carrier will release more oxygen to oxidize the carbon deposits to avoid coking and deactivation of the catalyst; Ni particle size is smaller and more distributed It is uniform and improves the catalytic activity of the catalyst. It can still maintain excellent reforming performance even after being poisoned by some active metal sulfur. The lanthanum oxide is mainly distributed in the surface phase, which can improve the high-temperature stability of the catalyst and avoid high-temperature sintering of the catalyst carrier.

Description

technical field [0001] The invention relates to the technical fields of catalytic reforming and hydrogen production from diesel oil, in particular to a nickel-based oxygen vacancy carrier catalyst and its preparation method and application. Background technique [0002] Environmental issues such as the greenhouse effect and air pollution are closely related to the sharp increase in fossil fuel consumption. Therefore, the transformation of energy structure and the sustainable use of energy have become urgent problems for human society. As a link between secondary energy and traditional energy, hydrogen energy has gradually entered people's field of vision and become a representative of clean energy. The continuous supply of hydrogen is a key link to promote the advent of the "hydrogen era". The raw materials for hydrogen production mainly include fuel, biomass and water. Hydrogen production from liquid fuel reforming, as a hydrogen production method with high energy efficie...

AI Technical Summary

Problems solved by technology

However, when applied to steam reforming of diesel oil, serious carbon deposition and sulfur poisoning deactivation occur, so it is difficult to maintain high activity and long-term catalytic performance

In order to ensure that the production cost of the catalyst meets the requirements of large-scale use and can withstand the diesel SR process, the carrier or additive of the catalyst should be adjusted. In order to ensure the mechanical strength and hydrothermal stability of the catalyst, Al 2 o 3 as the main carrier, rather than Al alone 2 o 3 As a carrier, such as using lanthanide metal oxides (La, Pr, Nd, Eu, Gd) as promoters, the activity and anti-coking performance of the catalyst have been improved to a certain extent, but there are still problems of low hydrogen yield and poor catalytic stability.

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