Magnesium MTT Molecular Sieve for Selective Hydroisomerization

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Solution Overview

Problem

There is a need for new molecular sieves with enhanced selectivities and activities in hydrocarbon conversion, gas separation, and drying processes, as existing sieves do not adequately meet the requirements for improved selectivity and activity.

Innovation Solution

The development of a molecular sieve, SSZ-94, with a unique MTT-type framework, containing magnesium oxide, which offers improved selectivity and activity in hydrocarbon conversion processes, particularly in hydroisomerization, by incorporating magnesium into the reaction mixture during synthesis.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If existing crystalline molecular sieves are used, then the basic catalytic function is provided, but the selectivity and activity for hydrocarbon conversion are insufficient

Engineering Contradiction:

Improvehydrocarbon conversion activityVSAvoidselectivity

Core Design Contradiction:

ProductivityVSReliability

Solution Approach 1:

The patent modifies the chemical composition parameters of the molecular sieve by incorporating magnesium in addition to aluminum, creating an aluminomagnesium silicate structure. This compositional parameter change results in new acid site properties and pore characteristics that simultaneously improve both activity and selectivity for hydrocarbon conversion

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent creates a composite molecular sieve structure combining aluminum and magnesium elements within the crystalline framework. This composite aluminomagnesium silicate material provides synergistic effects that enhance catalytic performance beyond what either element could achieve alone in traditional molecular sieves

Inventive Principle:

Principle #40Composite materials

2Reliability

If new molecular sieve structures are developed, then enhanced selectivity and activity are achieved, but the manufacturing complexity increases

Engineering Contradiction:

ImproveselectivityVSAvoidsynthesis process simplicity

Core Design Contradiction:

ReliabilityVSEase of manufacture

Solution Approach 1:

The patent achieves the novel aluminomagnesium silicate structure by adjusting synthesis parameters including molar ratios of precursors, crystallization temperature, and reaction time. These parameter modifications allow control over the crystalline structure and magnesium incorporation while maintaining a relatively straightforward hydrothermal synthesis process

Inventive Principle:

Principle #35Parameter changes

Applied Scientific Principles

This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.

Function Achieved in This Case

SSZ-94 demonstrates enhanced selectivity and activity in hydrocarbon conversion, achieving better isomerization conversion, lube yield, viscosity index, and reduced gas make compared to comparable catalysts lacking magnesium.

Implementation Method 1

catalyst comprises a molecular sieve comprising an MTT-type framework... for converting hydrocarbons, comprising contacting a hydrocarbonaceous feed under hydrocarbon converting conditions with a catalyst

Methodology Applied

Scientific EffectCatalysis: Catalysis

Data Source

PatentUS12623910B2Molecular sieve SSZ-94, catalyst, and methods of use thereof

Publication Date: 2026.05.12 CHEVRON USA INC

AI summary

The present application pertains to family of new crystalline molecular sieves designated SSZ-94. Molecular sieve SSZ-94 is structurally similar to sieves falling within the MTT structure type such as SSZ-32x, SSZ-32, ZSM-23, EU-13, ISI-4, and KZ-1 family of molecular sieves. SSZ-94 is characterized as having magnesium.