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    Silica-modified zeolite catalyst
    25.
    发明授权
    Silica-modified zeolite catalyst 失效
    硅改性沸石催化剂

    公开(公告)号：US4145315A

    公开(公告)日：1979-03-20

    申请号：US862461

    申请日：1977-12-20

    Applicant: Paul G. Rodewald

    Inventor： Paul G. Rodewald

    IPC: B01J29/40 ,  C07C1/20 ,  B01J29/06

    CPC classification number: B01J29/40 ,  C07C1/20 ,  B01J2229/26 ,  B01J2229/36 ,  B01J2229/42 ,  C07C2529/40

    Abstract: A catalyst is provided, which is especially applicable for the selective production of C.sub.2 -C.sub.3 olefins, comprising a crystalline aluminosilicate zeolite having a silica to alumina ratio of at least about 12, a constraint index, as hereinafter defined, within the approximate range of 1 to 12 and having contained within the interior crystalline structure thereof added amorphous silica in an amount of at least about 0.3 and preferably between about 0.5 and about 30 weight percent. The resultant catalyst is characterized by a n-hexane sorption capacity at a temperature of 90.degree. C. and a n-hexane partial pressure of 83 mm. of mercury which is at least 1 percent less than corresponding sorption capacity under identical conditions for the unmodified zeolite. Generally, the n-hexane sorption capacity for the described silica-modified zeolite, at the above specified conditions, is 5 to 60 percent less than that for the zeolite which has not undergone treatment to incorpoate amorphous silica therein. The invention described herein also encompasses synthesis of the specified catalyst and use of the same in selectively converting lower monohydric alcohols and their ethers, especially methanol and dimethyl ether, to a hydrocarbon mixture rich in ethylene and propylene.

    Catalyst for selective production of para dialkyl substituted benzenes
    27.
    发明授权
    Catalyst for selective production of para dialkyl substituted benzenes 失效
    用于选择性生产对二烷基取代的苯的催化剂

    公开(公告)号：US4090981A

    公开(公告)日：1978-05-23

    申请号：US726091

    申请日：1976-09-23

    Applicant: Paul G. Rodewald

    Inventor： Paul G. Rodewald

    IPC: B01J29/40 ,  B01J29/65 ,  B01J29/70 ,  C07C2/00 ,  C07C2/66 ,  C07C2/76 ,  C07C2/86 ,  C07C4/00 ,  C07C5/41 ,  B01J29/06

    CPC classification number: C07C4/00 ,  B01J29/40 ,  C07C2/00 ,  C07C2/66 ,  C07C2/76 ,  C07C2/864 ,  C07C5/41 ,  B01J2229/12 ,  B01J2229/26 ,  B01J2229/32 ,  B01J2229/42 ,  B01J29/65 ,  B01J29/70 ,  C07C2529/40 ,  C07C2529/65 ,  C07C2529/70 ,  Y02P20/52

    Abstract: A catalyst particularly applicable for the selective production of para dialkyl substituted benzenes is provided comprising a porous crystalline aluminosilicate zeolite which has undergone modification by deposition thereon of a coating of silica extensively covering, and residing substantially exclusively on the external surface thereof as a result of contact with a silicone compound of a molecular size incapable of entering the pores of the zeolite and subsequent heating in an oxygen-containing atmosphere to a temperature in excess of 300.degree. C. but below a temperature at which crystallinity of the zeolite is adversely affected at a rate such that the silicone compound does not volatilize prior to undergoing oxidation to silica. The zeolite is characterized by an activity, in terms of alpha value, of between about 2 and about 5000, a xylene sorption capacity greater than 1 gram/100 grams of zeolite and an ortho-xylene sorption time for 30 percent of said capacity of greater than 10 minutes, said sorption capacity and sorption time being measured at 120.degree. C. and a xylene pressure of 4.5 .+-. 0.8 mm. of mercury.

    Abstract translation: 提供了特别适用于选择性生产对二烷基取代的苯的催化剂，其包括多孔结晶硅铝酸盐沸石，其通过在其上沉积经过广泛覆盖的二氧化硅涂层进行改性，并且基本上仅在其外表面上作为接触的结果 具有分子大小不能进入沸石孔隙的硅氧烷化合物，随后在含氧气氛中加热到超过300℃的温度，但低于在沸石的结晶度受到不利影响的温度 速率使得硅氧烷化合物在氧化成二氧化硅之前不挥发。 沸石的特征在于α值在约2至约5000之间的活性，大于1克/ 100克沸石的二甲苯吸附容量和邻二甲苯吸附时间为30％的所述容量的较大值 10分钟以上，所述吸附容量和吸附时间在120℃下测量，二甲苯压力为4.5 +/- 0.8mm。 的汞。

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