The present disclosure relates to a composition that includes a first oxide having a phosphate, a ratio of Brønsted acid sites to Lewis acid sites between 0.05 and 1.00, and a total acidity between 50 μmol/g and 300 μmol/g, where the phosphate is at least one of a functional group covalently bonded to the first oxide and/or an anion ionically bonded to the first oxide.
Single-phase catalysis for reductive etherification of diesel bioblendstocks
作者:Glenn R. Hafenstine、Nabila A. Huq、Davis R. Conklin、Matthew R. Wiatrowski、Xiangchen Huo、Qianying Guo、Kinga A. Unocic、Derek R. Vardon
DOI:10.1039/d0gc00939c
日期:——
metal oxides with high catalytic activity, product selectivity, and regeneration stability. Batch reactor screening identified niobium phosphate (NbOPO4) as the most active acidic metal oxide catalyst support, which was downselected to synthesize single-phase catalysts by Pdloading. Several branched ethers with favourable fuel properties were synthesized to demonstrate broad catalyst applicability. The
还原醚化是一种有前途的催化化学方法,用于偶联生物质衍生的醇和酮,以生产支链醚,可用作柴油的高十六烷值,低烟灰混合原料。先前检查的用于还原性醚化的催化剂材料通常限于具有有限的热稳定性和工业适用性的金属氢化和酸性乙缩醛化催化剂的二元物理混合物。为了解决这个问题,我们开发了一种单相催化剂,该催化剂包含负载在酸性金属氧化物上的Pd,具有高催化活性,产物选择性和再生稳定性。间歇反应器筛选已鉴定出磷酸铌(NbOPO 4)作为活性最强的酸性金属氧化物催化剂载体,通过Pd负载被下选以合成单相催化剂。合成了几种具有良好燃料性能的支链醚,以证明其在催化剂中的广泛应用。新鲜的Pd / NbOPO 4催化剂的表面积为130 m 2 g -1,高酸度为324μmolg -1,Pd分散度为7.8%。使用酸性金属氧化物载体可提高反应温度,在190°C下对4-丁氧基庚烷的质量选择性为81%,表观活化能为40 kJ mol