Abstract:
A combination of fixed and fluid-bed catalytic reactions is achieved by employing fixed-bed catalysts (3) on supports (4) within the fluid-bed (2). The fluid-bed catalysts (2) may move in toth directions through the fixed bed (3), thereby giving advantages of both types of beds in one reactor (1).
Abstract:
A method for preparing a molecular sieving metallosilicate which comprises: (A) providing an aqueous dispersion of colloidal particles comprising contiguous mixtures of silica and the oxide of a transition metal selected from the group consisting of Sc, Ti, V, Cr, Mn, Fe, Co. Ni, Zn, Zr, Y or a mixture of two or more of said metals; (B) mixing an effective amount of a mineralizing agent and/or synthesis directing agent with said dispersion to form a gel; and (C) maintaining said gel at a temperature of 80°C to 300°C for an effective period of time to provide said metallosilicate.
Abstract:
A method for preparing a molecular sieving metallosilicate which comprises:
(A) providing an aqueous dispersion of colloidal particles comprising contiguous mixtures of silica and the oxide of a transition metal selected from the group consisting of Sc, Ti, V, Cr, Mn, Fe, Co. Ni, Zn, Zr, Y or a mixture of two or more of said metals; (B) mixing an effective amount of a mineralizing agent and/or synthesis directing agent with said dispersion to form a gel; and (C) maintaining said gel at a temperature of 80°C to 300°C for an effective period of time to provide said metallosilicate.
Abstract:
A process for the one esterification of aldehydes and alcohols comprises the steps of combining an aldehyde with an alcohol, in the presence of oxygen and in contact with a catalyst having the general formula PdTe.Zn d E. where E is one or more metals from the group consisting of group IA, IIA, IVA, IB, VIIB, or VIII metals, As or Sb; and a, d and e are from about 0 to 3 with the proviso that at least d or e ≠ 0.
Abstract:
A catalyst composition represented by the formula wherein A is selected Cd, Cr, Ge, Te, Th, Ti, U, V, Zr, rare earths and mixtures thereof; wherein D is selected from Ag, Cu, Mn and mixtures thereof; and wherein
a = 0-1.0 b = 0.75-1.5 c = 1.0-2.0 d = 0-2.0 a + d is greater than zero and x is the number of oxygens needed to satisfy the valence requirements of the remaining elements.
This catalyst is particularly suitable for the oxydehydrogenation of saturated carboxylic acids, such as isobutyric acid, to form alpha, beta unsaturated carboxylic acids, such as methacrylic acid.
Abstract translation:由式AaFebPcDdOx worin甲表示的催化剂组合物被选择镉,铬,锗,碲,钍,钛,U,V,锆,稀土和它们的混合物; worin D被选自Ag,Cu,Mn和它们的混合物; 和worin A = 0-1.0 B = C = 0.75-1.5 1.0-2.0 D = 0-2.0 A + D大于零,x是满足其余元素的化合价要求所需的氧的数量。 这种催化剂特别适用于饱和羧酸氧化脱氢,求作为异丁酸,形成α,β-不饱和羧酸,:如甲基丙烯酸。
Abstract:
A process for preparing a supported solid oxide complex catalyst using silica as support characterised in that one adds fumed silica to a mixture containing one or more active components of the catalyst; dries said mixture to form a dried first-stage mixture; adds, in solution. silica or a silica-containing compound other than fumed silica to the dried first stage mixture optionally with further fumed silica; and dries and calcines the resulting mixture is provided. The use of fumed silica produces a supported solid oxide complex catalyst of increased attrition resistance. Such catalyst is useful in the preparation of unsaturated aldehydes and acids from propylene or isobutylene by vapour phase oxidation. The use of inert or recycle gas increases the performance of such catalyst in this reaction.