含铜MCM-48催化剂上糠醛选择性加氢制糠醇(英文)

Copper-Containing MCM-48 Catalyst for the Selective Hydrogenation of Furfural to Furfuryl Alcohol

以MCM-48为载体,采用新颖的负载方法(有机官能团化法)制备了铜基负载型催化剂.结果表明,活性组分以较高的负载量均匀地分散在载体MCM-48表面,且负载活性组分后,分子筛的结构未被明显破坏.本文首次将采用此负载方法制备的铜基MCM-48催化剂用于糠醛选择性加氢制糠醇反应,并得到了较高的活性、稳定性及糠醇选择性,该催化剂可以与商业催化剂相比,具有潜在的工业应用价值.与一维结构的MCM-41相比,三维孔道结构的MCM-48有效避免了孔堵塞,大大提高了催化剂的稳定性.引入助剂镧有利于羰基加氢,明显提高了糠醛的转化率.使用后的催化剂并未被氧化,催化剂失活的主要原因之一是积炭.

Furfuryl alcohol is an important fine chemical and a chemical intermediate. It is industrially produced by the vapor phase hydrogenation of furfural, but the yield varies from furfuryl alcohol to 2-methylfuran, furan, tetrahydrofuran, tetrahydrofurfuryl alcohol, and ring-decomposition products such as pentanol and pentanediol, depending on the catalyst. Copper chromite is presently the commercial catalyst for the selective hydrogenation of furfural to furfuryl alcohol, but its toxicity causes severe environmental problems and there is a need to develop new chromium-free catalysts. There are some recent works on non-chromium catalysts for the selective hydrogenation of furfural, but few have used molecular sieves as the support for the active species. Seo et al investigated the hydrogenation of furfural over ion-exchanged Pd-CuY and Ni-CuY at 300℃. These catalysts gave a high selectivity for furfuryl alcohol but had a lower conversion of furfural. There was no discussion on the effect of temperature on the catalyst selectivity. Hao et al used mesoporous MCM-41 as the support and obtained high conversion of furfural and selectivity for furfuryl alcohol over the CuLa/MCM-41 catalyst. Another subgroup of the mesoporous M40s family, MCM-48, has not yet been studied.