硅的锗同构取代提供了具有弱酸中心的锗硅酸盐沸石,它们能够催化关键反应,如酮的拜耳-维利格氧化和乙酰丙酸的醚化。在此,我们首次证明UTL(Si / Ge = 4.2)和IWW(Si / Ge = 7.2)锗硅酸盐沸石是多元醇(例如乙二醇,甘油和1,4丁二醇)缩酮化成活性的活性和选择性催化剂。二氧戊环。在多元醇的缩酮化反应中,大孔IWW的性能优于超大孔UTL沸石,因此表明了在大体积血小板状UTL中的扩散限制晶体。吸附吡啶的FTIR光谱显示了UTL沸石的路易斯酸度,而活性更高的IWW催化剂的特征是水诱导的布朗斯台德酸度。升高活化温度(200–450°C)会降低IWW锗硅酸盐中布朗斯台德酸中心的浓度(即T act分别为200、300和450°C时,分别为0.16、0.07和0.05 mmol g -1),但会增加两种沸石中路易斯酸位点的数量。在优化的反应条件下(例如,丙酮/甘油= 25,T作用=
A novel melamine--formaldehyde resin (MFR) supported solid acid with Lewis and Brønsted acid sites was synthesized through the immobilization of acidic ionic liquid and cuprous ion on MFR. The scanning electron microscopy (SEM) characterization showed that addition of PEG-2000 in the synthesis of MFR could promote the formation of regular particles with diameters around 3.7 \mu m. The XRD pattern demonstrated that some cuprous ions were aggregated. The catalytic performance of this acid catalyst was evaluated by acetalization. The results showed that the catalytic activity of MFR with Brønsted acid could be improved by addition of Lewis acid. The solid acid was very efficient for the acetalization of carbonyl compounds and diols with moderate to excellent yields and there was no loss of catalytic activity even after being recycled for 6 runs.
PRODUCTION OF HYDROXY ETHER HYDROCARBONS BY LIQUID PHASE HYDROGENOLYSIS OF CYCLIC ACETALS OR CYCLIC KETALS
申请人:Billodeaux Damon Ray
公开号:US20120330069A1
公开(公告)日:2012-12-27
A liquid phase hydrogenolysis of acetal compounds such as cyclic acetals and cyclic ketals are fed to a reaction zone and reacted in the presence of a noble metal catalyst supported on a carbon or silica support to make hydroxy ether mono-hydrocarbons in high selectivity, without the necessity to use acidic co-catalysts such as phosphorus containing acids or stabilizers such as hydroquinone.
CATALYSTS FOR THE PRODUCTION OF HYDROXY ETHER HYDROCARBONS BY VAPOR PHASE HYDROGENOLYSIS OF CYCLIC ACETALS AND KETALS
申请人:Devon Thomas James
公开号:US20120330067A1
公开(公告)日:2012-12-27
Catalyst compositions of palladium supported on alumina or zirconium oxide supports having low or no silicon dioxide contents and having a specific surface area or modified with alkali, alkaline earth, or phosphine oxide compounds are selective in a vapor phase hydrogenolysis reaction to convert cyclic acetal compounds and/or cyclic ketal compounds in the presence of hydrogen to their corresponding hydroxy ether hydrocarbon reaction products.
PRODUCTION OF HYDROXY ETHER HYDROCARBONS BY VAPOR PHASE HYDROGENOLYSIS OF CYCLIC ACETALS AND KETALS
申请人:Devon Thomas James
公开号:US20120330066A1
公开(公告)日:2012-12-27
A vapor phase hydrogenolysis reaction to convert cyclic acetal compounds and/or cyclic ketal compounds in the presence of hydrogen to their corresponding hydroxy ether hydrocarbon reaction products using a supported noble metal catalyst. The hydrogenolysis reaction can be carried out in the vapor phase and in the absence of a polyhydroxyl hydrocarbon co-solvent.
NICKEL MODIFIED CATALYST FOR THE PRODUCTION OF HYDROXY ETHER HYDROCARBONS BY VAPOR PHASE HYDROGENOLYSIS OF CYCLIC ACETALS AND KETALS
申请人:Billodeaux Damon Ray
公开号:US20120330068A1
公开(公告)日:2012-12-27
Catalyst compositions of alumina supports containing palladium and nickel are selective in a vapor phase hydrogenolysis reaction to convert cyclic acetal compounds and/or cyclic ketal compounds in the presence of hydrogen to their corresponding hydroxy ether hydrocarbon reaction products.