A process is described for producing paraxylene, in which an aromatic hydrocarbon feedstock comprising benzene and/or toluene is contacted with an alkylating reagent comprising methanol and/or dimethyl ether in an alkylation reaction zone under alkylation conditions in the presence of an alkylation catalyst to produce an alkylated aromatic product comprising xylenes. The alkylation catalyst comprises a molecular sieve having a Constraint Index5, and the alkylation conditions comprise a temperature less than 500 C. The alkylation catalyst may be selectivated to produce a higher than equilibrium amount of paraxylene by using a molar ratio of alkylating agent to aromatic of at least 1:4.

Systems and methods are provided for reducing the end point of distillate fuel boiling range fractions while reducing or minimizing conversion of the distillate fuel to naphtha or light ends. To perform end point reduction, a distillate boiling range fraction is exposed to a conversion catalyst that has a total surface area of at least 200 m.sup.2/g, an average pore size of 12 Angstroms or more, and/or a low acidity, where the conversion catalyst includes a supported Group 8-10 metal, such as a supported Group 8-10 noble metal. Such a conversion catalyst can have improved activity for reducing end point of a distillate fuel fraction while reducing or minimizing conversion relative to 177 C. Performing end point reduction using such a catalyst can allow for increased yields of distillate fuel boiling range products by allowing increased amounts of heavy feed components to be included in the input to a distillate fuel processing train.

The present disclosure relates to catalyst systems which may be useful for the dehydrogenation of hydrocarbons. According to one or more embodiments, the catalyst systems may include a zincosilicate support material, one or more alkali or alkaline earth metals, and one or more platinum group metals. The zincosilicate support material may include an MFI framework type structure incorporating at least silicon and zinc. The present disclosure also relates to methods for the production of such catalyst systems as well as methods for the use of such catalyst systems for the dehydration of hydrocarbons.

The present disclosure relates to catalyst systems which may be useful for the dehydrogenation of hydrocarbons. According to one or more embodiments, the catalyst systems may include a zincosilicate support material, one or more alkali or alkaline earth metals, and one or more platinum group metals. The zincosilicate support material may include an MFI framework type structure incorporating at least silicon and zinc. The present disclosure also relates to methods for the production of such catalyst systems as well as methods for the use of such catalyst systems for the dehydration of hydrocarbons.

The present disclosure relates to catalyst systems which may be useful for the dehydrogenation of hydrocarbons. According to one or more embodiments, the catalyst systems may include a zincosilicate support material, one or more alkali or alkaline earth metals, and one or more platinum group metals. The zincosilicate support material may include an MFI framework type structure incorporating at least silicon and zinc. The present disclosure also relates to methods for the production of such catalyst systems as well as methods for the use of such catalyst systems for the dehydration of hydrocarbons.

According to one or more embodiments presently disclosed, one or more reactant hydrocarbons may be dehydrogenated by a method that includes contacting the one or more reactant hydrocarbons with a catalyst system to dehydrogenate at least a portion of the reactant hydrocarbons. The catalyst system may include a zincosilicate support material that includes an MFI framework type structure incorporating at least silicon and zinc. The catalyst system may further include one or more alkali or alkaline earth metals, and one or more platinum group metals.

According to one or more embodiments presently disclosed, a catalyst system may be made by a method that includes introducing one or more alkali or alkaline earth metals to a zincosilicate support material, and introducing one or more platinum group metals to the zincosilicate support material. The zincosilicate support material may include an MFI framework type structure incorporating at least silicon and zinc.

According to one or more embodiments presently disclosed, a catalyst system may be made by a method that includes introducing one or more alkali or alkaline earth metals to a zincosilicate support material, and introducing one or more platinum group metals to the zincosilicate support material. The zincosilicate support material may include an MFI framework type structure incorporating at least silicon and zinc.

The present invention relates to a method for synthesizing N,N-bis(2,2,6,6-tetramethyl-4-piperidyl)-1,3-benzenedicarboxamide as shown in the following formula (III), ##STR00001## comprising the following steps that a compound of the following formula (I) and a compound of the following formula (II) react under stirring in an organic solvent in the presence of a solid supported catalyst, and after the completion of the reaction, a compound of the formula (III) is obtained by post-treatment, ##STR00002## wherein R1 to R2 are each the same or different selected from C.sub.1-6 alkyl. The method can achieve good technical effects through the use of a unique catalyst and the compounding of the organic solvent, has the advantages of reduced pollution, good environment and significant improvement on yield compared with the prior art, can provide more inexpensive functional additives for the field of plastic processing, and has good industrial production prospects and application potential.

Disclosed is a fuel additive which may remove varnish precursor species in a jet fuel. In particular, the fuel additive may be a multi-functional adsorbent which includes a 2-dimensional or 3-dimensional interconnected mesoporous or mixed micro-/mesoporous framework and a plurality of internal cavities formed in the mesoporous or mixed micro-/mesoporous framework and the internal cavities include charged sites to accommodate fuel contaminants for varnish formation, such as metal ions and heteroatomic contaminants. In addition, methods of preparing the multi-functional adsorbent and methods for removing varnish precursor species with the fuel additive are provided.